[Sarkari-Naukri] Re: Harish Sati, ABB Placement Paper (Technical)

hey please

1. Give me the same for electronics engineer

technical paper for electronics engineer

questions that are asked in companies for electronics engineer

2. The list of companies for electronics engineer

3. My another question is what should an electronics engineer do after B.E.

if he didn't get a good job.........technical field left for him/her.

other than MBA what  are the field left an electronics engineer to get a good job

Thanks

On Thu, Oct 8, 2009 at 1:44 PM, Harish Sati <harish.sati@gmail.com> wrote:

ABB Placement Paper (Technical)

(1) in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be the resultant frequency.

(a)less than 50 (b)more than 60(c)in between 50 & 60 (d)none

according to our conclusion answer will be none because if we apply two frequency component resultant frequency we can not say with such an ease. U should confirm the answer

2.In a ckt a single resistor is connected across a d.c. source, what will be the effect on current in first resistor if we connect one more resistance in parallel with earlier one.

Ans:- no change since it is a parallel combination.

3.why we don,t like flashover in transmission line (t-line)-

(a ) it may create earth fault  ( b ) it reduces the life of insulator.....

4.total no of strands in a acsr conductor is 81, then what is the no. of conductor in its outer layer....(a)36 (b)18 (c)24.......Also read some more on acsr.

5.Two questions based on p.u. calculation like , p.u. calculation is given with respect to some old base and u have to calculate it with reference to new base.

6.which table is referred for sag calculation-

Ans:- stringing 

7.in a R-L ckt a ac voltage is applied , such that instantaneous power is negative for 2ms, then what will be the power factor.

(a) 9 deg, (b) 18 deg, (c) 36 Deg

8. In an incandescent lamp

(a) luminous intensity is more than non-luminous intensity

(b) ,, ,, ,, less ,, ,,

Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm it further.

9. In which motor no-load to full-load diff. is lowest

(a) series motor, (b) shunt motor, (c) Compound motor

Ans: (b)

10. In a 60Hz induction motor full load speed is 850 rpm then what is the Synchronous speed. 

(a) 900 rpm, (b) 950 rpm, (c) 1600 rpm Ans: (a)

11. A sync. Motor is running at synch. Speed, if al of sudden D.C. excitation is removed, then

(a) it will rotate at slip speed,  (b) it will stop,  ( c) it will continue to rotate at sync. Speed

Ans: (a), because actually it will acts as Induction motor.

12. A transmission line is designed for 50Hz, 440KV. If we want to transfer power at 60Hz, 440 KV, then the power transfer capability will

(a) decrease, (b) Increase, (c) None

Ans: (a).as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque angle.

13. Increased rotor resistance in rotor ckt of induction motor is related with

(a) high starting torque, (b) more speed variation   Ans: (a)

14. In the formulae E = 4.44 f N Ô, Ô is

(a) Avg value, (b) Rms value, (c) Maximum value   Ans: (a)

15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then rms power is

16. Input impedence of MOSFET is

Ans:-  more than BJT

17. Remember truth table of AND, NOR, NAND, OR, EX-OR ETC...

18. What is Truth Table Explain?

19. Conversion of Binary number into Equivalent decimal No.

20. Megger is used for the measurement of 

(a) Insulation resistance, (b) Conductor resistance  Ans: (a)

21. Form factor for sinusoidal as well as DC

22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is

(a) short transmission line, (b) long, (c) medium.  Ans: (a)

23. Improvement in power factor reduces

(a) power consumed by consumer, (b) power generation, (c) both a & b    Ans: (c)

24. Read about field test of Series Motor

25. No-load test for Synchronous motor, the graph is drawn

Ans:- stator open ckt emf Vs field current

26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating power has a frequency 

(a) 50 Hz, (b) 100, (c) no oscillating power is there in resistive ckt.   Ans: (a)

27. Insulation used in transformer ___________leakage flux.

(a) increases, (b) decreases.  Ans: (b)

28.After rain what happens to Insulator 

(a) break-down strength of Insulator decreases, (b) Arch length reduces   Ans: (b)

29.Diversity factor helps to ............(what ?)

[Read diversity factor, load factor, Reserve capacity factor in depth, with calculation]

30. Why capacitance is shown as a Shunt element in analysis of transmission line

(a) it is between Conductor & earth, (b) because Admittance is used for calculation of capacitive reactance   Ans: (a)

31. B-R-Y sequence is followed in three phase system, if phase voltage in B-phase is Vm sin 100, then the phase voltage in R-phase would be 

Ans:- Vm sin (-20)

32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is 

Ans:-  pure resistive ckt

33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is the time constant?

Ans: time constant = L/R = 0.5

34. In electro-dynamometer A' meter & wattmeter the type of scale is

Ans: Non-uniform

35. For the same current carrying capacity corona loss of ACSR will be ________than copper conductor. 

(a) more, (b) less, (c) equal. Ans:(b)

36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor, then what happens to the illumination, if we change the capacitance.

Ans: No change at all

37. Read about surge impendence of over-head and under-ground cable, Surge impedence formula = sqrt(L/C)

--
with warm regards

Harish Sati
Indira Gandhi National Open University (IGNOU)
Maidan Garhi, New Delhi-110068

(M) + 91 - 9990646343 | (E-mail) Harish.sati@gmail.com

--~--~---------~--~----~------------~-------~--~----~
You have subscribed to the Groups "Sarkari-naukri" of http://sarkari-naukri.blogspot.com at Google.com.
Send email to Sarkari-naukri@googlegroups.com for posting.
Send email to
Sarkari-naukri-unsubscribe@googlegroups.com to unsubscribe.
Visit this group at
http://groups.google.com/group/Sarkari-naukri?hl=en
-~----------~----~----~----~------~----~------~--~---